COMP vs PEN: Correlation
How closely do Compass, Inc. (COMP) and Penumbra, Inc. (PEN) trade together? Their weekly returns over three years give a correlation of 0.39, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are COMP and PEN?
Across a 3-year window, the weekly returns of COMP and PEN correlate at 0.39, moderate. Little has changed lately, as the 1-year reading of 0.31 lands near the 3-year figure. Stretching to 5 years gives 0.41, with an annualized covariance of 868.6 %².
By 3-year correlation, PEN places #9 of the 14 assets tracked against COMP. Twelve-month performance is nearly a tie, at +19.6% for COMP and +20.3% for PEN. Risk is not evenly split, since COMP carries 1.7 times the volatility of the other side.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
COMP vs PEN: side by side
| COMP (Compass, Inc.) | PEN (Penumbra, Inc.) | |
|---|---|---|
| 1-year return | +19.6% | +20.3% |
| 5-year return | -33.6% | +18.7% |
| Volatility (ann.) | 61.9% | 36.0% |
| Beta vs S&P 500 | 1.54 | 0.30 |
| Max drawdown (3Y) | -50.8% | -45.5% |
| Market cap | $8.5B | $12.6B |
| P/E (trailing) | 185.0 | 79.5 |
| Dividend yield | 0.00% | 0.00% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | COMP | PEN |
|---|---|---|
| 2022 | -74.4% | -22.6% |
| 2023 | +61.4% | +13.1% |
| 2024 | +55.6% | -5.6% |
| 2025 | +80.7% | +30.9% |
| 2026 | +5.0% | +3.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are COMP and PEN good diversifiers for each other?
A fair diversifier. At 0.39, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between COMP and PEN?
As of 2026-08-27, the correlation of weekly returns between COMP and PEN is 0.39 over 3 years, 0.31 over 1 year and 0.41 over 5 years.
Is PEN a good diversifier for COMP?
A fair diversifier. At 0.39, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.39 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/comp-vs-pen.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/comp-vs-pen/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: COMP correlations · PEN correlations
